Physics on the Road 1 - Mapping Space and Time

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Physics on the Road 1 - Mapping Space and Time

  1. 1. Mapping SpaceMapping Space and Timeand Time Topic – Physics on the RoadTopic – Physics on the Road Lesson 1Lesson 1
  2. 2. LEARNINGLEARNING INTENTIONS…INTENTIONS…  Know that speed is distance divided byKnow that speed is distance divided by time; v = s/ttime; v = s/t  That speed can be calculated from aThat speed can be calculated from a distance-time graph.distance-time graph.  The meaning of average andThe meaning of average and instantaneous speed and how these areinstantaneous speed and how these are calculated from distance - time graphs.calculated from distance - time graphs.
  3. 3. TransportTransport  Geneticist Steve JonesGeneticist Steve Jones “…“…there is little doubt that the mostthere is little doubt that the most important event in recent human historyimportant event in recent human history was the invention of the bicycle”was the invention of the bicycle”
  4. 4. QuantityQuantity symbolsymbol unitsunits velocity (orvelocity (or speed)speed) vv metres per secondmetres per second m/sm/s oror msms-1-1 displacementdisplacement (or distance)(or distance) ss metresmetres mm timetime tt secondsseconds ss accelerationacceleration aa metres per second permetres per second per secondsecond m/s/sm/s/s oror msms-2-2
  5. 5. Distance – time dataDistance – time data Time /sTime /s Distance / mDistance / m 00 00 1010 100100 1616 200200 2828 500500 4040 800800 6060 10001000
  6. 6. QuestionsQuestions 1.1. Mark acceleration, deceleration andMark acceleration, deceleration and constant speed.constant speed. 2.2. What is the average speed of thisWhat is the average speed of this journey?journey? 3.3. What is the highest instantaneousWhat is the highest instantaneous speed?speed?
  7. 7. GradientGradient  Explain the importance ofExplain the importance of understanding gradient in interpretingunderstanding gradient in interpreting distance time data. In terms ofdistance time data. In terms of 1.1. identifying changes of velocityidentifying changes of velocity 2.2. calculating instantaneous speedcalculating instantaneous speed
  8. 8. 1.1.You are watching a batsman hit a cricketYou are watching a batsman hit a cricket ball. If 0.375 s passes between the time youball. If 0.375 s passes between the time you see him strike the ball and the time you hearsee him strike the ball and the time you hear the sound of this, how far from the batsmanthe sound of this, how far from the batsman are you sitting? The speed of sound in air isare you sitting? The speed of sound in air is 340 ms340 ms–1–1 .. 2.2. A girl diving from a 15 m platform wishes toA girl diving from a 15 m platform wishes to know how fast she enters the water. She is inknow how fast she enters the water. She is in the air for 1.75 s and dives from rest (with anthe air for 1.75 s and dives from rest (with an initial speed of zero). What can you tell herinitial speed of zero). What can you tell her about her entry speed?about her entry speed?
  9. 9. 3. An experiment performed on the Moon3. An experiment performed on the Moon finds that a feather falls 20.75 m from restfinds that a feather falls 20.75 m from rest in 5 s. What is its speed as it hits thein 5 s. What is its speed as it hits the Moon's surface?Moon's surface? 4.4.Sketch a graph to represents the variationSketch a graph to represents the variation in vertical height with time for a ball thrownin vertical height with time for a ball thrown upwards and returning to the thrower.upwards and returning to the thrower. From this graph sketch a velocity–timeFrom this graph sketch a velocity–time graph.graph.
  10. 10. 3. An experiment performed on the Moon3. An experiment performed on the Moon finds that a feather falls 20.75 m from restfinds that a feather falls 20.75 m from rest in 5 s. What is its speed as it hits thein 5 s. What is its speed as it hits the Moon's surface?Moon's surface? 4.4.Sketch a graph to represents the variationSketch a graph to represents the variation in vertical height with time for a ball thrownin vertical height with time for a ball thrown upwards and returning to the thrower.upwards and returning to the thrower. From this graph sketch a velocity–timeFrom this graph sketch a velocity–time graph.graph.

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